If you know CMD_EI_API class, you are aware of its power. It's very helpful for the manipulation of customer master data, all master data including contacts. I have played with this class many times and ...
... and then I've collected all the checks that have assigned pseudo comments. The version of NW that I was extracting pseudo comments from is 7.52 SP02.
Now you can also use this information as I'v ...
... So I did some debugging and found a place where after extraction of data from DB, the contact persons where deleted from internal tables.
So I went deeper and saw that there is a table CVIC_MAP_CONTACT ...